arch: arm: dts: k3-am625-phycore-som-binman: Add custMpk to overlays

There are some device-tree overlays with missing entries for the
keyfile. Add them to sign all images in the U-Boot FIT image.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
1 file changed